Montana SWPPP Compliance
Quick Facts for Montana
- Authority: Montana DEQ (MT)
- Permit: General Permit for Storm Water (MTR100000)
- Inspection Schedule: Every 7 days + 24h after 0.25" rain
- Rain Trigger: 0.25 inches
Regulation Overview
Permitting Authority
Official Permit
Inspection Frequency
Rain Event Trigger
Inspection Requirements for Montana
Construction projects that disturb one or more acres—or smaller sites that are part of a larger common plan—commonly require stormwater permit coverage in Montana. Eligibility, exemptions, local approvals, and project-specific conditions vary, so confirm coverage under the General Permit for Storm Water (MTR100000) before construction begins.
Operational Insight
Use the permit-defined schedule as the baseline and document each completed inspection. Project size, receiving water, stabilization status, or local approvals may change the frequency shown here.
Specific State Nuance
Strict 0.25 inch trigger. Winter shutdowns allowed but must be documented.
Common BMPs Checked in Montana
- Silt Fences & Perimeters
- Construction Entrances
- Concrete Washout Areas
- Inlet Protection
- Stockpile Management
- Dust Control
Continue your field review
Check common controls in the BMP field guide, then compare them with your approved SWPPP.
Regulatory Filing
Agency Contact
Official Resources
Why Go Digital?
Handwritten logs are hard to read and easy to lose. Digital reports provide a timestamped, geo-tagged audit trail that protects your business.